Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cap truc » cau truc, tap trac, tap tuc
hieu cac » hieu luc, hieu va, hieu van
hieu cao » chieu cao, hieu ca, kieu cao
hau tren » dau tren, cau tren, thai tren
sach ky » sac ky, sach y, sach ty
truc va » thuc va, thuc vat, trung va
dan dai » dat dai, can dai, dan dat
dai hau » dai han, dai hai, dai huu
va dan » ca dan, va dao, va dau
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang ((x hoi) or (o hoi)). ((hieu cao) or (hieu cac)) cap truc va dan dai hau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((x hoi) OR (o hoi)). ((hieu cao) OR (hieu cac)) cap truc va dan dai hau tren.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ((x hoi) or (o hoi)). ((hieu cao) or (hieu cac)) cap truc va dan dai hau tren*.