Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
phan lap » phan dau
truc va » thuc va, thuc vat, trung va
va phan » van phan, va phat, va phap
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
hieu su » hieu sau, tieu su, hieu so
nang ho » nang hoc, nang co, tang ho
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
ho hoi » hoc hoi, hoa hoi, hoi hoi

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 ty nang ho hoi. ((hieu su) or (hieu va)) cau truc va phan lap ((cua triet) OR (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ho hoi. ((hieu su) OR (hieu va)) cau truc va phan lap ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ho hoi. ((hieu su) or (hieu va)) cau truc va phan lap ((cua triet) OR (cua viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ho hoi. ((hieu su) or (hieu va)) cau truc va phan lap ((cua triet) OR (cua viet))*.