Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
nuoc van » nuoc va, nuoc san, luoc van
van dang » van dong, van dung, van nang
dang hai » dang khai, hang hai, dung hai
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
cua tuc » cua duc, cua tu, cua thuoc
cua te » cua tu

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 ma) or (sang ma)) hoi. lieu va cac nuoc van dang hai ((cua te) or (cua tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y ((nang ma) OR (sang ma)) hoi. lieu va cac nuoc van dang hai ((cua te) OR (cua tuc)).
• Adding a wildcard symbol may retrieve word variants: thuat sach y ((nang ma) or (sang ma)) hoi. lieu va cac nuoc van dang hai ((cua te) or (cua tuc))*.