Perhaps you should try some spelling variations:
chua thiet » chuan thiet, cua thiet, thua thiet
chua trieu » cua triet, cau trieu, chua tri
van tinh » van thinh, van minh, ban tinh
tinh ca » tinh cao, tinh cua, tinh va
sach ly » sach y, sach lo, sach ty
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
ly nang » ky nang, ly hang, ly vang
cam lo » nam lo, cam ly, cam o
lo van » le van, vo van, so van
ma hoi » mai hoi, ma hoa, me hoi
ve cam » ve cham, ve cac, va cam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ly nang ((ma hoi) or (xa hoi)). hieu ve cam lo van tinh ca ((chua trieu) OR (chua thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly nang ((ma hoi) OR (xa hoi)). hieu ve cam lo van tinh ca ((chua trieu) OR (chua thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ly nang ((ma hoi) or (xa hoi)). hieu ve cam lo van tinh ca ((chua trieu) OR (chua thiet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ly nang ((ma hoi) or (xa hoi)). hieu ve cam lo van tinh ca ((chua trieu) OR (chua thiet))*.