Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
dang hai » dang khai, hang hai, dung hai
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
hai cua » thai cua, dai cua, hoi cua
ly nang » ky nang, ly hang, ly vang
va dang » van dang, va nang, va lang
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
cua te » cua tu
y nang » ky nang, v nang, may nang
ma hoi » xa hoi, ma hoa, me hoi

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 ((y nang) OR (ly nang)) ((ma hoi) or (mai hoi)). hieu va cac nuoc va dang hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((y nang) OR (ly nang)) ((ma hoi) OR (mai hoi)). hieu va cac nuoc va dang hai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ((y nang) OR (ly nang)) ((ma hoi) or (mai hoi)). hieu va cac nuoc va dang hai cua te*".