Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu sau » hieu suat, tieu su, hieu va
van hanh » van thanh, ban hanh, van anh
tai cua » thai cua, tri cua, dai cua
kham ly » khao ly, khanh ly
sach ty » sach y, sach tu, sach thu
hieu su » tieu su, hieu so, hieu suat
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ly van » le van, ly va, ly von
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ty nang ma hoi. ((hieu su) OR (hieu sau)) kham ly van hanh ((tai cua) or (tai cuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ty nang ma hoi. ((hieu su) OR (hieu sau)) kham ly van hanh ((tai cua) OR (tai cuc)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ty nang ma hoi. ((hieu su) OR (hieu sau)) kham ly van hanh ((tai cua) or (tai cuc)) tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach ty nang ma hoi. ((hieu su) OR (hieu sau)) kham ly van hanh ((tai cua) or (tai cuc)) tre*.