Perhaps you should try some spelling variations:
thuat lap » thuat lanh, thuat xay, thuat bai
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
cau duc » cao duc, cau luc, chu duc
va tinh » may tinh
tinh de » tinh da, sinh de, tinh he
cua tre » cua te, cuu tre, cua triet
de cua » le cua, te cua, dieu cua

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) or (thuat lap)) ky nang xa hoi. ((hieu van) OR (thien van)) cau duc va tinh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat lap)) ky nang xa hoi. ((hieu van) OR (thien van)) cau duc va tinh de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuat lap)) ky nang xa hoi. ((hieu van) OR (thien van)) cau duc va tinh de cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat lap)) ky nang xa hoi. ((hieu van) OR (thien van)) cau duc va tinh de cua tre*.